Equation 126 · Part 1 · The Bend an Elevator Cannot Fake
Symbol Phi
What this part means
Phi is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Its job in the formula
Phi is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol Phi→Article meaning
The passage around this formula
For Earth modelled as a point mass, = -GM/r gives a radial second derivative of magnitude 2GM/ and, since is harmonic in vacuum, transverse second derivatives of magnitude GM/ with the opposite sign — a trace-free tensor in the exact ratio 2:{-1}:{-1} . With the standard gravitational parameter G =…
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.